Automotive
Automotive is one of the most demanding environments a molded rubber part will ever see. Heat cycling under the hood, road salt and moisture underbody, constant vibration, and millions of flex cycles over a vehicle’s service life all put real stress on a part, and there’s no tolerance for a seal that leaks or a mount that fails at 80,000 miles. Moldtech manufactures custom rubber components for automotive OEMs and Tier 1/Tier 2 suppliers to the print, material spec, and PPAP documentation your program requires.
Automotive Rubber Parts: Built to Your Print, Not Off a Shelf
Moldtech is a custom molder. We don’t sell parts out of a catalog, and we don’t design parts and then shop them around; every automotive component we produce is molded to a specification your team (or your design partner) has already engineered. You own the part design and the tooling. Moldtech’s role is to manufacture it to spec, consistently, at the volume your program requires, and to advise on moldability, material selection, and process along the way when it’s useful.
That distinction matters in automotive sourcing. If your team already has a print, a material callout, or an existing tool you need production support on, we can quote against it directly. If you’re still finalizing the design, our engineers will flag anything that affects moldability, flash, knit line placement, or cycle time before it becomes a tooling problem, but the design decisions, and the tool itself, stay yours.
Partner With Moldtech for Custom Automotive Rubber Parts
Moldtech provides end-to-end services for automotive programs, from initial design input through final assembly, and our capabilities include thermoset rubber injection molding, compression/transfer molding, sponge/foam molding, micromolding, and overmolding/bonding. With this expertise, we manufacture components engineered to withstand the conditions unique to automotive applications such as sustained heat cycling under the hood, road salt and moisture underbody, constant vibration, and millions of flex cycles over a vehicle’s service life. We craft components like:
Our vertically integrated manufacturing facility in Lancaster, NY operates 24 hours a day, five days a week, giving automotive programs the scalability and production consistency that high-volume platforms require.
We’re proud to partner with automotive OEMs and Tier suppliers on the seals, mounts, boots, and molded components that keep vehicles quiet, sealed, and reliable across their service life.
Overmolding for Automotive Assemblies
When an automotive part needs rubber bonded directly to metal or plastic, Moldtech’s overmolding and bonding process molds the rubber and integrates the substrate in a single step. That eliminates a secondary assembly operation, removes a potential failure point at the bond line, and holds tighter positional tolerance between the rubber and the insert than post-mold assembly typically allows. It’s a common request on automotive programs where a part needs both a rigid mounting interface and a rubber sealing or isolating surface.
Materials for Under-the-Hood and Underbody Conditions
Moldtech works primarily in thermoset elastomers, which hold their shape and sealing force through sustained heat and compression far better than thermoplastic materials over a vehicle’s service life. Material selection depends on where the part lives on the vehicle and what it’s exposed to:
| Elastomer | Temp Range | Automotive Relevance |
| Nitrile (NBR / Buna-N) | -40°F to +250°F | Oil and fuel resistance: driveline, fuel system, hydraulic components |
| EPDM | -65°F to +300°F | Ozone, weathering, coolant resistance: door/body seals, cooling system |
| Fluorocarbon (FKM / Viton) | -20°F to +400°F | Broad chemical and fuel resistance: under-hood, high-heat zones |
| Silicone (VMQ) | -65°F to +400°F | Wide temperature range, stays flexible in cold: engine bay, electronics sealing |
| HNBR | -40°F to +300°F | Higher heat and oil resistance than standard NBR: timing belt and drivetrain seals |
Full material and coating capabilities, including specialty compounds and elastomeric coatings, are covered on our Capabilities page.
A Manufacturing Partner Built for Automotive Volume and Quality Requirements
Moldtech is certified to IATF 16949:2016, the quality management standard automotive OEMs and Tier suppliers require of their molders, in addition to ISO 9001:2015. We’re a vertically integrated manufacturer based in Lancaster, NY, running close to 50,000 square feet of production space across three shifts, five days a week, which means design input, mold building, molding, and final assembly all happen under one roof, under one quality system, without handoffs between vendors.
For automotive programs specifically, that in-house control matters at both ends of the relationship: it’s what makes PPAP documentation, first-article inspection, and process consistency straightforward to support, and it’s what keeps piece price stable, because scrap, rework, and missed ship dates cost an automotive program far more than a few cents a part. We’d rather quote you an honest number once than a low number that moves later.
Moldtech supports automotive production at both prototype and high-volume scale, and we’re proud to count Bosch among the manufacturers who rely on us for automotive components.
Request a Quote
Have a print ready, or need help getting there? Contact Moldtech’s team to talk through your automotive part’s geometry, material, and volume requirements.